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139894-31-8

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139894-31-8 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 139894-31-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,9,8,9 and 4 respectively; the second part has 2 digits, 3 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 139894-31:
(8*1)+(7*3)+(6*9)+(5*8)+(4*9)+(3*4)+(2*3)+(1*1)=178
178 % 10 = 8
So 139894-31-8 is a valid CAS Registry Number.

139894-31-8Upstream product

139894-31-8Relevant articles and documents

Diastereoselective ester enolate alkylations. Asymmetric syntheses of 3-alkyl-3-carbomethoxy-2-exo-methylenecyclohex-5-en-1-ones

Schultz, Arthur G.,Taylor, Richard E.

, p. 3937 - 3943 (2007/10/02)

Enolate 12, designed to take advantage of potential chelation sites on the chiral auxiliary, (S)-2-(methoxymethyl)pyrrolidine, gives excellent diastereoselectivities for alkyl-, propargyl-, and cyanomethylations; negligible diastereoselectivities were observed for allyl- and benzylations. The resulting 3-substituted 3-carbomethoxy-1,4-cyclohexadienes 3a-g were converted to 3-substituted 3-carbomethoxy-2-exo-methylenecyclohex-5-en-1-ones 4a-g. Experiments designed to detect the possible involvement of single-electron transfer during alkylation of enolate 12 indicate that alkylations most probably occur via the SN2 pathway.

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